fix(toxoptions): handle nullptr in parameters

Use the c-toxcore default settings in case we don't have own settings.

src/core/toxoptions.cpp

@@ -3,12 +3,11 @@
 #include "src/core/icoresettings.h"
 #include "src/core/toxlogger.h"
 
+#include <tox/tox.h>
+
 #include <QByteArray>
 #include <QDebug>
 
-// TODO(sudden6): replace this constant with the function from toxcore 0.2.3
-static const int MAX_PROXY_ADDRESS_LENGTH = 255;
-
 /**
  * @brief The ToxOptions class wraps the Tox_Options struct and the matching
  *        proxy address data. This is needed to ensure both have equal lifetime and
@@ -51,6 +50,31 @@ ToxOptions::operator Tox_Options*()
 std::unique_ptr<ToxOptions> ToxOptions::makeToxOptions(const QByteArray& savedata,
                                                        const ICoreSettings* s)
 {
+    Tox_Options* tox_opts = tox_options_new(nullptr);
+
+    if (!tox_opts) {
+        qWarning() << "failed to create Tox_Options";
+        return {};
+    }
+
+    // need to init proxyAddr here, because we need it to construct ToxOptions
+    const QString proxyAddr = s == nullptr ? QString{} : s->getProxyAddr();
+
+    auto toxOptions = std::unique_ptr<ToxOptions>(new ToxOptions(tox_opts, proxyAddr.toUtf8()));
+    // register log first, to get messages as early as possible
+    tox_options_set_log_callback(*toxOptions, ToxLogger::onLogMessage);
+
+    // savedata
+    tox_options_set_savedata_type(*toxOptions, savedata.isNull() ? TOX_SAVEDATA_TYPE_NONE
+                                                                 : TOX_SAVEDATA_TYPE_TOX_SAVE);
+    tox_options_set_savedata_data(*toxOptions, reinterpret_cast<const uint8_t*>(savedata.data()),
+                                  savedata.size());
+
+    if(s == nullptr) {
+        qDebug() << "Using Tox default settings";
+        return toxOptions;
+    }
+
     // IPv6 needed for LAN discovery, but can crash some weird routers. On by default, can be
     // disabled in options.
     const bool enableIPv6 = s->getEnableIPv6();
@@ -59,7 +83,6 @@ std::unique_ptr<ToxOptions> ToxOptions::makeToxOptions(const QByteArray& savedat
     const bool enableLanDiscovery = s->getEnableLanDiscovery() && !forceTCP;
     ICoreSettings::ProxyType proxyType = s->getProxyType();
     quint16 proxyPort = s->getProxyPort();
-    QString proxyAddr = s->getProxyAddr();
 
     if (!enableLanDiscovery) {
         qWarning() << "Core starting without LAN discovery. Peers can only be found through DHT.";
@@ -70,28 +93,13 @@ std::unique_ptr<ToxOptions> ToxOptions::makeToxOptions(const QByteArray& savedat
         qWarning() << "Core starting with IPv6 disabled. LAN discovery may not work properly.";
     }
 
-    Tox_Options* tox_opts = tox_options_new(nullptr);
-
-    if (!tox_opts) {
-        return {};
-    }
-
-    auto toxOptions = std::unique_ptr<ToxOptions>(new ToxOptions(tox_opts, proxyAddr.toUtf8()));
-    // register log first, to get messages as early as possible
-    tox_options_set_log_callback(*toxOptions, ToxLogger::onLogMessage);
-
-    // savedata
-    tox_options_set_savedata_type(*toxOptions, !savedata.isNull() ? TOX_SAVEDATA_TYPE_TOX_SAVE
-                                                                  : TOX_SAVEDATA_TYPE_NONE);
-    tox_options_set_savedata_data(*toxOptions, reinterpret_cast<const uint8_t*>(savedata.data()),
-                                  savedata.size());
     // No proxy by default
     tox_options_set_proxy_type(*toxOptions, TOX_PROXY_TYPE_NONE);
     tox_options_set_proxy_host(*toxOptions, nullptr);
     tox_options_set_proxy_port(*toxOptions, 0);
 
     if (proxyType != ICoreSettings::ProxyType::ptNone) {
-        if (proxyAddr.length() > MAX_PROXY_ADDRESS_LENGTH) {
+        if (static_cast<uint32_t>(proxyAddr.length()) > tox_max_hostname_length()) {
             qWarning() << "proxy address" << proxyAddr << "is too long";
         } else if (!proxyAddr.isEmpty() && proxyPort > 0) {
             qDebug() << "using proxy" << proxyAddr << ":" << proxyPort;